Here's a U.S.-model reference 2744 in both a worldtime and non-worldtime versions. The original dealer catalog shows the worldtime version with the 2nd version of the worldtime dial:


Interesting bit of trivia: both worldtime dial styles (concentric and radial) were offered simultaneously in the same years as shown by the additional dealer catalog page from the same year:
Also note:
1) The U.S. version of the Memovox was marketed as the "Beau Brummel Alarm" at this time
2) Also note that there were pocket alarms issued with worldtime dials from the factory
Greg